Hope this makes sense. Imagine I have a polysurface (a cube) above another polysurface (a wider box below the cube) and I want to move the cube’s bottom surface vertically until it reaches the wider box top surface.
Currently I am sub-selecting the cube’s bottom surface, then activate move with vertical constraint. In this mode I can snap to any of the wider box points (thus snapping to its “z”) but how can I snap to that same “z” without snapping to those points? (i.e. by hovering the mouse over the surface’s “middle” instead of its points?